PART GORE mcstos 1. Forveasting as Weather, Ferecaste of retioaetivfall-out depend primarily co foretaste of the wind field. Consequently, falleoe’ forecasts ean be no better than thevdndforecaste themselves, Mirch is yot te be leamed about the tropical atacsphere. Groat advances have becst made in this field in the last two decades, but mush is still unimow: about the physical processes whieh affect and contred the woather over the Marshall Islands area and consequently which chango the wad pettornes over this aros. The winds aloft ever this partieular part of the tropies have always been considored verystablo, with fow variabilitios -this fact ts usually borns out by elinatelogical statistics, bus scot by the diy te day changos in tho wind feld,-upen whieh winds aloft and fall-cut forecasts must be made. be Winds Aleft Obeervstions and Porodksts, Tho winds alofs | foredasts themselves arc only as good as the accuraey of tho: wind cbescr- vations. Obsorvational data of winds aleft are considered to bo very accurate if made with GMD-lA equipmant. All ebscrvations in the Marshalls wore madc with oust oquipment during Opcration CASTILE with tho oxcoptios of ship cbecrveatvenr'made by the USS CURTISS. Scarch radar installo¢ aboard that ship used-fur malting the winds aicftcbsorvations; procedures vith thie-oquigmont: wefo sonsidoreg éf oqual accuracy to the GD-Li equipnent. The cbeorvations and forccasts avaiable during CASTLE wore as follewee ? (2) Tre weather obscrvational network consisted of stations at EXIWSTOK, BIEDNT, RONCERIK, MAJURO, KUSATE, PONAPE and KWAJALEIN, with data from MIDWAY, WAKE, MARCUS, GUAM, IWO JIMA and JOHNSTON boing a most $2 |